Parker Engine Mobile OE: Racor Products Blog & Information - North America

Racor GreenMAX Features & Functions

Learn about the features and functions of the Racor GreenMAX FF/WS from Chris Chin in this short video, including the function of the Direct Inject Fuel Blending Valve.


Hi, my name is Chris Chin w/ Parker Hannifin Racor Division.

I’m here to share with you the features & benefits of our GreenMAX Series FF/WS.

The compact design was engineered for flow rates up to 150 gph. It weighs less, and has a larger and more efficient cartridge element than the leading competitor.

It meets and exceeds all OEM engine requirements and specifications; such as particulate removal efficiency (SAE J1985 & ISO 19438), water droplet removal (SAE J1839), emulsified water removal (J1488), differential pressure testing/dirt holding capacity (SAE J905).

Let’s highlight the features & benefits of the GreenMAX FF/WS:

It has the optional Direct Inject Fuel Blending Valve – we’ll talk more about this in detail later in the video.

There’s two inlet/outlet ports strategically positioned front and back of the assembly.

Also, the optional high displacement primer pump for easy re-prime while servicing the element.

We have a compact and profile reducing bracket with two common bolt-hole patterns.

For an instant fuel quality check, the GreenMAX features a durable and high capacity clear bowl.

The assembly is engineered for a bottom load cartridge filter, with media micron retentions of your choice; 2, 10, 30, or our new Depth Coalescing Media, which is ideal for biodiesel applications.

Within the bowl assembly, there’s an optional 200 watt, 12 volt (or 24V) electric in-bowl heater.

Additionally, there’s the optional Water-in-fuel sensor.

Lastly, the signature Racor Self-venting drain.

Ok, let’s talk about some common concerns regarding cold weather start up:

In cold weather, the dissolved wax paraffin present in the fuel may reach it’s a cloud point. This means the wax paraffin crystallizes out of the fuel and forms a gelatinous build-up of the fuel filter.

The heavier the formation of the wax paraffin (also known as gelling) will cause your filter to become blinded off, adding restriction to the system, thereby shutting down your engine.

Without treatment this will happen in approximately 10-15 minutes after start up. Then you’re at the mercy of waiting for a tow truck and incur a costly tow bill!

Obviously, this is dependent of the type of diesel and climate within your region. The colder the climate, the heavier the wax paraffin build up.

The 200 watt, 12 volt electric in-bowl heater is a starting aid and will only heat up static, non-flowing fuel in the assembly.

Once the engine is started, the fuel flow is now 6 liters per minute, which makes the 200 watt, 12 volt electric in-bowl heater option ineffective.

Furthermore, no aftermarket electric heat options will provide any useful heat rise to your fuel flowing at 6 liters per minute. Therefore, the threat of wax paraffin build up on the filter is imminent in cold weather and electric heaters are not a viable solution for flowing fuel.

As a short term solution, drivers have combatted the gelling issues with additives. However, you need to dose your fuel accordingly; lighter dilution for a threat of frost and heavier dilution for severe weather. But you can only dose so much before this practice is cost prohibitive or becomes ineffective during prolonged inclement conditions.

Coolant (or radiator) heat is another method to add heat to your fuel to combat wax paraffin. This method uses hot coolant from the radiator to heat a metal tube or block assembly within the filter housing. Heat transfer occurs when the tube or block assembly comes in contact with the fuel.

Here’s the catch: your radiator is the last component of the engine to heat up within 15-20 minutes. Too late; your filter is already blinded off.

During the initial 10-15 minutes after start up, the interface between the fuel flowing 6 liters per minute and a metal tube or block assembly heated by the coolant is too short for any significant heat transfer to occur for this method to be effective.

The solution is to use the (Racor) Direct Inject Fuel Blending Valve:

Recall, you need the 200 watt, 12 volt electric in-bowl heater to warm the static, non-flowing fuel to help start your engine.

Once your engine is started, the engine block will heat up. Within approximately 3 minutes, the engine will provide a significant heat rise between the engine and fuel. Any unconsumed fuel will be returned to the fuel tank much warmer.

Again, by using the direct inject fuel blending valve, this will take any unconsumed engine return fuel (which is warmer) and divert it to the upstream-side of the filter element.

Recall, the wax paraffin build up will occur on the upstream-side of the filter element. Now you will have warmer, unconsumed return fuel from the engine being directly blended with the cooler fuel coming from the fuel tank, providing instantaneous heat rise. This heat rise will keep wax paraffin buildup from occurring and most importantly, keep your truck running.

The Direct Inject Fuel Blending Valve is thermostatically controlled by a wax actuator to open and divert fuel at <80°F; closes and bypasses to fuel tank at >100°F.

Well, there you go. I hope this video gave you additional insight to our product.

For additional information on how to order various configurations of the GreenMAX 4400/6600 Series FF/WS, visit

Featured Products

New DC Filter


Engine Mobile OE - North America

209 521 7860


Engine Mobile OE - Europe

+44 (0) 1924 487 037

Search Posts By Tags